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**minowz** · 09-09-2012, 04:10 AM

Just a guess but reckon the insulation/isolation would have to be able to sustain at least the peak voltages associated with three phase mains power, from different sources + some for spikes.

Depending on what parts of the circuit, the insulation properties may vary from 500V-3KV as may be relevant to the question. There are of course layout proximity considerations, and temperature and humidity considerations in design layout.

A lot of it comes down to the insulation/isolation between transformer windings and the optocoupler [if used]. Possibly in some designs no transformer is used, can't be sure. Doubtful though, as is probably a requirement. In some applications have seen multiple series capacitors used for isolation, but that may not be practical in charger designs.

http://www.onsemi.com/pub_link/Collateral/DN06009-D.PDF

09-09-2012, 04:10 AM	#16
minowz Join Date Oct 2005 Posts 445 Senior Member	Just a guess but reckon the insulation/isolation would have to be able to sustain at least the peak voltages associated with three phase mains power, from different sources + some for spikes. Depending on what parts of the circuit, the insulation properties may vary from 500V-3KV as may be relevant to the question. There are of course layout proximity considerations, and temperature and humidity considerations in design layout. A lot of it comes down to the insulation/isolation between transformer windings and the optocoupler [if used]. Possibly in some designs no transformer is used, can't be sure. Doubtful though, as is probably a requirement. In some applications have seen multiple series capacitors used for isolation, but that may not be practical in charger designs. http://www.onsemi.com/pub_link/Collateral/DN06009-D.PDF
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